diff --git a/estimator/reduction.py b/estimator/reduction.py
index 1800cba..0a4c1f9 100644
--- a/estimator/reduction.py
+++ b/estimator/reduction.py
@@ -390,7 +390,7 @@ def _short_vectors_sieve(self, beta, d, N=None, B=None, preprocess=True, sieve_d
             self.delta(sieve_dim) ** (sieve_dim - 1) * self.delta(beta) ** (1 - sieve_dim)
         )
 
-        #arbitrary choice
+        # arbitrary choice
         if c > 2**1000:
             c = oo
             return (rho, oo, oo, sieve_dim)
@@ -888,7 +888,7 @@ def short_vectors(self, beta, d, N=None, preprocess=True, B=None, C=5.46, sieve_
         rho = sqrt(4 / 3.0) * RR(
             self.delta(sieve_dim) ** (sieve_dim - 1) * self.delta(beta) ** (1 - sieve_dim)
         )
-        
+
         if N == 1:
             if preprocess:
                 return 1.0, self(beta, d, B=B), 1, beta
@@ -902,7 +902,7 @@ def short_vectors(self, beta, d, N=None, preprocess=True, B=None, C=5.46, sieve_
         c = c0 / floor(c1)
         sieve_cost = C * 2 ** RR((self.NN_AGPS[self.nn]["a"] * sieve_dim + self.NN_AGPS[self.nn]["b"]))
 
-        #arbitrary choice
+        # arbitrary choice
         if c > 2**1000:
             c = oo
             return(rho, oo, oo, sieve_dim)